function send_text() {
  $this->Sms->api_id = '000000';
  $this->Sms->api_user = 'youruser';
  $this->Sms->api_pass = 'apipassword';
  $this->Sms->api_from = 'fromcid';
  $message = sprintf("Hello World");
  $this->Sms->postSms($number, $message);
}